272 results about "Bismuth nitrate" patented technology

The invention discloses a method for preparing a bismuth ferrite composite catalytic material by using red mud as well as a product and application of the bismuth ferrite composite catalytic material. The method comprises the following steps: mixing chlorine salt and red mud, uniformly stirring, adding a hydrochloric acid solution, uniformly stirring, roasting, recovering flue gas generated in the roasting process, and obtaining roasting residues and roasting dust generated by recovering the flue gas after roasting is finished; and mixing the roasted dust and bismuth nitrate, uniformly stirring, adding the calcined residue, uniformly grinding, adding water, stirring, drying the material, and calcining to obtain the bismuth ferrite composite catalytic material. The preparation process is simple, the red mud is used as a main raw material, and full-amount resource utilization of the red mud can be achieved. The prepared composite catalytic material can be used for efficiently purifying landfill leachate, and COD, ammonia nitrogen, total phosphorus and heavy metal pollution are efficiently removed through a photocatalysis mechanism.

The invention discloses a high-dispersion graphene conductive adhesive solution for a battery and a preparation method of the high-dispersion graphene conductive adhesive solution, and belongs to the technical field of conductive adhesive solutions. The high-dispersion graphene conductive adhesive solution for the battery prepared by the invention is prepared from the following raw material components in parts by mass: 6 to 8 parts of high-dispersion graphene, 4.5 to 13.5 parts of an adhesive and 60 to 90 parts of a solvent, the preparation method comprises the following steps: ultrasonically dispersing graphene in a mixed solution of hexadecyl triyl ammonium bromide and deionized water, sequentially adding hexadecyl triyl ammonium bromide, sodium molybdate dehydrate, bismuth nitrate pentahydrate and cerium nitrate hexahydrate, uniformly stirring and dispersing, performing hydrothermal reaction, washing, drying, grinding and sieving to obtain the high-dispersion graphene. The adhesive is prepared from an amphiphilic polyethylene glycol-polycaprolactone block copolymer and amphiphilic polyacrylate.

The invention discloses a nitrogen-doped oxygen-vacancy-rich three-dimensional flower-shaped bismuth oxide electrocatalyst as well as a preparation method and application thereof, relates to the technical field of electrocatalysts, and solves the problems that a traditional bismuth oxide catalyst is insufficient in electron transfer capability and low in active site utilization rate. The preparation method comprises the following steps: dissolving bismuth nitrate, polyvinylpyrrolidone and sodium oleate in a mixed solvent of methanol and N, N-dimethylformamide, and stirring and dissolving to obtain a solution A; the preparation method comprises the following steps: dissolving 1, 3, 5-tri (4-carboxyl phenyl) benzene in a mixed solvent of methanol and N, N-dimethylformamide, and stirring and dissolving to obtain a solution B; and adding the B into the A, uniformly stirring, heating in an oil bath, reacting under magnetic stirring, cooling to room temperature, filtering, washing and drying the product to obtain white powder, calcining in a tubular furnace to obtain three-dimensional flower-shaped Bi2O3, putting in the tubular furnace, introducing argon, introducing ammonia gas, heating, and carrying out heat preservation reaction to obtain the electrocatalyst. The catalyst can be used for catalyzing nitrogen reduction synthesis ammonia reaction.

The invention provides an efficient environment-friendly petroleum passivator as well as a preparation method and application thereof, and belongs to the technical field of passivators. The preparation method comprises the following steps: reacting bismuth nitrate with tetra (4-carboxyl phenyl) porphyrin and benzoic acid to prepare a carboxyl phenyl porphyrin bismuth-MOF material, reacting antimony nitrate with tetra (4-pyridyl) porphyrin and benzoic acid to prepare a pyridyl porphyrin antimony-MOF material, and performing sol-gel reaction on lanthanum isopropoxide and cerium isopropoxide to prepare lanthanum-cerium sol; the preparation method comprises the following steps: mixing calcium nitrate, magnesium chloride, organic acid, organic amine and hydrogen peroxide for reaction to prepare a calcium / magnesium organic matter, mixing the calcium / magnesium organic matter with other substances, adding the mixture into an acetonitrile / ethanol mixed solvent, and uniformly stirring and mixing to prepare the efficient environment-friendly petroleum passivator. The high-efficiency environment-friendly petroleum passivator prepared by the invention is green, safe, non-toxic and efficient, has better capturing and passivating effects on metal ions such as nickel and vanadium in the catalytic cracking reaction process of heavy oil, improves the activity of a catalyst, prolongs the service life of the catalyst, and thus, has a wide application prospect.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a manganese ferrite / bismuth tungstate heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving sodium tungstate dihydrate, bismuth nitrate pentahydrate and hexadecyl trimethyl ammonium bromide in deionized water, and obtaining bismuth tungstate by using a hydrothermal method; 2) dissolving ferric chloride hexahydrate and manganese chloride tetrahydrate in water, then adding a sodium hydroxide solution, and obtaining manganese ferrite by using a hydrothermal method; and 3) dissolving bismuth tungstate and manganese ferrite into a sodium hydroxide solution, stirring, and drying to obtain the manganese ferrite / bismuth tungstate heterojunction photocatalyst. The formation of the heterojunction can greatly improve the activity of the manganese ferrite / bismuth tungstate in photocatalytic reduction of carbon dioxide.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a graphite-phase carbon nitride / iron-doped bismuth oxychloride heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, putting urea into a crucible with a cover, and calcining in air by utilizing a thermal polymerization method to obtain graphite-phase carbon nitride; then uniformly dispersing the graphite phase carbon nitride into a mannitol solution in which bismuth nitrate pentahydrate is dissolved, then adding ferric nitrate nonahydrate and potassium chloride into the solution, and obtaining the graphite phase carbon nitride / iron-doped bismuth oxychloride heterojunction photocatalyst by utilizing a hydrothermal method. The formation of the heterojunction can greatly improve the activity of the graphite-phase carbon nitride in photocatalytic reduction of carbon dioxide.

The present invention discloses a method for preparing a glass fiber diaphragm modified with a bismuth-based metal organic framework material, comprising: (1) using bismuth nitrate pentahydrate and trimesic acid as raw materials, and synthesizing a bismuth-based metal organic framework material by solvent thermal reaction; (2) adding the bismuth-based metal organic framework material prepared in step (1) and polyvinylidene fluoride to an N-methylpyrrolidone solution for mixing; (3) modifying the mixed solution obtained in step (2) onto a glass fiber diaphragm by a suction filtration method, and obtaining a glass fiber diaphragm modified with a bismuth-based metal organic framework material after drying. The present invention also discloses a glass fiber diaphragm modified with a bismuth-based metal organic framework material obtained by the above-mentioned preparation method and its application in a zinc ion battery. The glass fiber diaphragm modified with a bismuth-based metal organic framework material provided by the present invention can improve its electrochemical performance when applied to a zinc ion battery, thereby solving the problem of poor cycle performance of ordinary glass fiber diaphragms applied to aqueous batteries.

The invention discloses a strontium-doped bismuth titanate-based ferroelectric film and a preparation method thereof, and belongs to the technical field of dielectric energy storage materials. The chemical composition of the film is Ba < 1-x > Sr < x > Bi < 4 > Ti < 4 > O < 15 >, wherein x ranges from 0.025 to 0.1. The preparation method comprises the following steps: mixing ethylene glycol monomethyl ether and ethylene glycol, adding bismuth nitrate, barium acetate, strontium acetate and butyl titanate, fully stirring and filtering to obtain a precursor solution, aging, dripping to the center of a substrate for spin coating, heating a spin-coated sample to obtain a dry film, and annealing to obtain the ferroelectric film. The method is low in technological condition requirement, and the thin film obtains the optimal energy storage density by changing the doping proportion of Sr. According to the ferroelectric film, when x is equal to 0.075, the leakage current density of Ba0. 925Sr0. 075Bi4Ti4O15 (BBST75) is only 1.59 * 10 <-7 > A / cm < 2 >, the breakdown field strength is as high as 3.22 MV / cm, and at the moment, the film has the energy storage density of 28.2 J / cm < 3 > and the energy storage efficiency of 80.36%.

The invention discloses a preparation method of a beaded cobalt-doped Bi25FeO40 / BiFeO3 nanofiber wave-absorbing material, which comprises the following steps: obtaining a precursor by a standing method, and adding the precursor, bismuth nitrate, ferric nitrate and a spinning aid into a mixed solvent compounded by N, N-dimethylformamide and absolute ethyl alcohol to obtain a spinning solution; spinning the spinning solution by adopting an electrostatic spinning technology to obtain a nanofiber membrane; and finally, drying and calcining to obtain the wave-absorbing material. According to the wave-absorbing material, multiple reflection and scattering of electromagnetic waves are increased, the absorption performance of the electromagnetic waves is improved, due to the fact that a heterogeneous interface is generated after two phases are compounded, the interface polarization loss is further increased, when the thickness of the wave-absorbing material is 2.33 mm, the minimum reflection loss reaches-56.01 dB, the effective absorption frequency band width is 6.32 GHz, and the whole Ku wave band is covered.

The invention relates to the technical field of electrocatalytic reduction of carbon dioxide, and provides a water-phase ultrafast green preparation method of a bismuth-based metal organic framework, and the preparation method of the bismuth-based metal organic framework material comprises the following steps: taking bismuth nitrate pentahydrate as a bismuth source, taking trimesic acid as a ligand, and preparing the bismuth-based metal organic framework material through a surfactant-mediated sonochemistry method. A complex topological bismuth-based metal organic framework (CAU-17) is synthesized in water under an environmental condition. The synthesis method is rapid, environmentally friendly, low in cost and easy to operate, cetyltrimethylammonium bromide (CTAB) amphiphilic molecules are used as a structure inducer, removal (dehydration) of non-coordinated water is controlled, the deprotonation degree of ligands is improved, therefore, coordination and crystallization in an aqueous solution are adjusted, and by adjusting the dosage of the added CTAB, the deprotonation degree of the ligands is increased. And the crystal structure evolution from a preferentially generated compact sheet structure to a porous rod-shaped structure is realized. Meanwhile, the synthesized CAU-17 catalyst shows relatively high current density and Faraday efficiency in electrocatalytic reduction of carbon dioxide into formic acid, and has relatively good selectivity.

The invention relates to the technical field of sewage treatment, and discloses a photocatalytic material and a preparation method and application thereof.The method comprises the following steps that bismuth nitrate pentahydrate and sodium bromide are added into a mannitol solution according to the molar ratio of 1: 1.5, and ultrasonic dispersion is conducted to form turbid liquid; adding arginine into the turbid liquid, wherein the molar ratio of the arginine to the bismuth nitrate pentahydrate is (0-2.5): 1; adjusting the pH value of the turbid liquid and stirring to obtain a precipitate; the precipitate is filtered, washed and dried, and the photocatalytic material nVBi-(110) BiOBr is obtained.By means of the photocatalytic material, the removal rate of hexavalent chromium in alkaline wastewater with the pH being 7-10 can still exceed 90% within a short time, the photocatalytic material shows excellent stability and reaction activity, the technical problem that hexavalent chromium is difficult to remove efficiently in the alkaline environment is successfully solved, and the photocatalytic material has good application prospects. The method has important environmental application value and popularization potential.

The invention discloses a yeast bionic BiVO4 composite photocatalytic material and a synthesis method and application thereof.The synthesis method comprises the steps that firstly, bismuth nitrate pentahydrate, sodium dodecyl benzene sulfonate, nitric acid, ammonium metavanadate and sodium hydroxide serve as raw materials, yeast is added at the same time, and a yeast / BiVO4 composite photocatalyst is prepared through a hydrothermal reaction; and the photocatalyst is used for photocatalytic degradation of 2, 4-dichlorophenol. A hydrothermal reaction method is used, and the synthesis process is simple; the yeast / BiVO4 composite material is of a spherical structure, and compared with a traditional nano-powder or random-form catalyst, the three-dimensional spherical photocatalyst has the main advantages that the three-dimensional spherical photocatalyst is derived from a unique physical structure and can bring chemical property improvement, so that the efficiency of photocatalytic degradation of 2, 4-dichlorophenol is improved.

The invention belongs to the technical field of all-vanadium redox flow battery electrodes, and particularly relates to a bismuth metal modified electrode, a preparation method, application and an all-vanadium redox flow battery. The preparation method comprises the following steps: dissolving a bismuth source in an organic solvent to prepare an impregnation liquid; soaking the polyacrylonitrile-based graphite felt in the impregnation liquid, taking out the polyacrylonitrile-based graphite felt, and drying the polyacrylonitrile-based graphite felt to obtain a bismuth-source-impregnated polyacrylonitrile-based graphite felt; and performing Joule thermal pulse discharge heating on the polyacrylonitrile-based graphite felt impregnated with the bismuth source, washing and drying to obtain the bismuth metal modified electrode. The voltage of Joule thermal pulse discharge heating is 24-36 V, and the current is 56-83 A. According to the preparation method, joule thermal equipment is adopted for pulse calcination, bismuth metal particles are generated on the surface of the polyacrylonitrile-based graphite felt in situ, and the problem that the metal particles are prone to agglomeration is solved. Meanwhile, when the bismuth source is bismuth nitrate, nitrogen doping is synchronously realized while active sites of bismuth metal particles are introduced, so that the hydrophilicity and the reaction activity of the polyacrylonitrile-based graphite felt electrode are improved.

The invention discloses a preparation method and application of a heterojunction catalyst based on a two-dimensional zinc porphyrin metal organic framework, and belongs to the field of photochemical energy conversion and photocatalytic degradation. The invention aims to solve the technical problems of high-quality preparation of the artificial photosynthetic photocatalytic composite material and how to effectively improve the photochemical energy conversion efficiency. The method comprises the following steps: 1, dissolving bismuth nitrate pentahydrate, sodium tungstate dihydrate and sodium dodecyl dimethyl benzene sulfonate in deionized water, fully stirring, and transferring the solution to a reaction kettle for hydrothermal reaction; cooling to room temperature, washing and drying to obtain bismuth tungstate solid powder; 2, adding bismuth tungstate and meso-tetra (4-carboxyl phenyl) porphin into a mixed solution of N, N-dimethylformamide and ethanol, carrying out ultrasonic treatment, and fully stirring to obtain a solution A; dissolving zinc nitrate hexahydrate, pyrazine and polyvinylpyrrolidone in a mixed solution of N, N-dimethylformamide and ethanol, and fully stirring to obtain a solution B; after the solution is fully dissolved, dropwise adding the solution B into the solution A under ultrasonic and stirring conditions, and then putting the beaker into an oil bath pan for heating; and cooling to room temperature, washing, and storing in an ethanol solution to obtain the Zn-MOF / Bi2WO6 heterojunction composite material.

The invention relates to a preparation method and application of an ultra-efficient nitrate-based free radical activation catalyst, and the preparation method comprises the following steps: S1, dissolving bismuth nitrate Bi (NO3) 3.5 H2O and polyvinylpyrrolidone (PVP) in a mannitol solution; s2, adding potassium bromide into the solution in the step S1, and performing ultrasonic treatment to form a white suspension; s3, transferring the suspension into a high-pressure reaction kettle for hydrothermal reaction; and S4, after the reaction is completed, cooling, centrifugally collecting precipitates, washing, and carrying out vacuum freeze drying to obtain the bismuth oxybromide BixOBr nanosheet catalyst. According to the application of the super-efficient nitrate-based free radical activation catalyst in degradation of organic pollutants, the bismuth oxybromide BixOBr nanosheet catalyst is added into a water body containing nitrate, the nitrate is activated to generate free radicals by utilizing the piezoelectric effect induced by photoinduced deformation of the photocatalyst under the condition that an external electric field and an oxidizing agent are not needed, and the degradation efficiency of the nitrate-based free radical activation catalyst is improved. Therefore, organic pollutants are degraded.

The application relates to a preparation method of a composite semiconductor photocatalyst and application thereof, and comprises the following steps: preparing g-C3N4 nanosheets; dispersing the prepared g-C3N4 nanosheets into methanol at a mass fraction of 10% to 70%, then adding 750 mg of trimesic acid and 150 mg of bismuth nitrate, and ultrasonic treating for 10 min to obtain a mixed suspension; transferring the mixed suspension into a microwave reaction kettle for reaction, the reaction temperature is 90 to 130 DEG C, the reaction time is 30 to 60 min, and centrifugal drying is carried out after the reaction is completed; then g-C3N4 / Bi-MOF is obtained through anhydrous methanol washing and freeze drying; a heterostructure is constructed, the energy band structure is changed, the charge transmission resistance is reduced, the photocatalytic activity is improved, the photocatalyst has two different structure and property photocatalytic activity centers, and the photocatalytic activity is changed from the energy band structure and the catalytic activity.

This invention discloses a method for preparing a Bi3O4Br catalyst for the efficient degradation of tetracycline, comprising the following steps: S1, mixing bismuth nitrate and potassium bromide in an aqueous solution at room temperature, stirring, and filtering after the reaction to obtain a precipitate; S2, washing and drying the obtained precipitate to obtain a BiOBr precursor; S3, placing the obtained BiOBr precursor in a sodium hydroxide solution of a certain concentration and reacting at a certain temperature to obtain the Bi3O4Br catalyst. Experimental results show that the Bi3O4Br catalyst has a larger specific surface area and more photocatalytic active sites than pure Bi3O4Br, and has a higher oxygen vacancy (OV) concentration, exhibiting high catalytic activity in the photocatalytic degradation of tetracycline. This photocatalyst has broad practical value and application prospects.

The invention discloses a device and method for synthesizing a fourth-generation refrigerant R1235ze through photocatalysis of VDF, and belongs to the technical field of green chemical engineering. The core of the method is that a g-C3N4 / BiVO4 heterojunction photocatalyst is adopted to catalyze VDF to react with hydrogen chloride to generate R1234ze under the mild condition of 70-90 DEG C under the irradiation of simulated sunlight (AM1.5 G). The catalyst is prepared by taking melamine, bismuth nitrate and ammonium metavanadate as precursors and carrying out hydrothermal reaction and calcination treatment under specific conditions. The matched industrial system realizes the whole process integration from the continuous preparation of the catalyst to the online separation of the product. According to the method, the reaction temperature is successfully reduced to about 80 DEG C from traditional 400 DEG C or above, energy consumption is reduced by about 75%, CO2 emission is reduced by about 60%, meanwhile, the product selectivity is not lower than 93%, the quantum efficiency is not lower than 12%, the purity reaches up to 99.5% or above, and a subversive solution is provided for green and low-cost industrial production of R1234ze.

This invention relates to the field of nano-silver powder preparation technology, specifically a method for preparing high-tap-density, high-purity silver powder. This invention overcomes the problems of insufficient purity and low tap density in existing silver powder technologies. The invention involves preparing a solution of silver nitrate, performing electrolytic pretreatment, and then obtaining a silver powder suspension through chemical reduction, co-precipitation, and dissolution-reduction processes. The silver powder suspension is then subjected to physical vapor deposition, where silver vapor is deposited onto the silver powder surface under the action of argon gas, resulting in a dense arrangement of silver powder particles. An electrolyte is then prepared using silver nitrate and bismuth nitrate for electrolytic refining. Finally, high-tap-density, high-purity silver powder is obtained through ultrasonic dispersion and supercritical fluid drying. By strictly controlling the process sequence and parameters, and utilizing the synergistic effect between each process, impurities are effectively removed, the particle size distribution of the nano-silver powder is optimized, and the purity and tap density of the nano-silver powder are improved, thus optimizing the application of silver powder in conductive materials.

The application discloses a preparation method of a photocatalyst for CO2 reduction and application thereof. The photocatalyst is prepared through the following steps: first, preparation of the photocatalyst bismuth oxysulfate; second, metal loading modification of the photocatalyst bismuth oxysulfate. Thiocyanic acid and bismuth nitrate are used as raw materials to synthesize the photocatalyst bismuth oxysulfate, and copper chloride or silver nitrate reagent is selected as a material for metal loading modification of the bismuth oxysulfate, and the selected materials are inexpensive and easy to purchase, and the economic cost is low. The photocatalyst prepared by the method has the advantages of high selectivity, can accelerate electron movement under light conditions, promotes CO2 reduction degradation, and has high stability, and is an ideal photocatalyst. Compared with existing photocatalyst materials, the material has high catalytic degradation reducibility and selectivity, high stability, and when used as a CO2 photocatalyst, can efficiently reduce and convert CO2 into multi-carbon products.

The invention discloses a preparation method and application of a ferroelectric enhanced core-shell structure artificial photosynthetic heterojunction catalyst, and belongs to the field of solar energy conversion and photocatalytic degradation. The invention aims to explore the technical problems of low-cost green preparation, high photoelectric conversion efficiency and photocatalytic performance improvement of the photocatalyst. The method comprises the following steps: 1, respectively dissolving bismuth nitrate pentahydrate and iron nitrate nonahydrate in ethylene glycol in sequence, heating in a water bath, stirring, aging, transferring sol into an air dry oven, drying to obtain gel powder, grinding, transferring the powder into a muffle furnace, and calcining to obtain BiFeO3 powder (named as BFO); and 2, dissolving thioacetamide in deionized water, fully stirring, adding the BFO prepared in the step 1, transferring the solution into an ultrasonic cleaning machine, carrying out ultrasonic dispersion, transferring the solution into a reaction kettle, carrying out heating reaction, cooling, washing, and drying to obtain the ferroelectric enhanced Bi2S3 / BFO photocatalyst with a stable heterojunction structure.

The application provides a preparation method of bismuth nanoparticle material and application thereof, and dissolves bismuth nitrate pentahydrate in ethylene glycol to prepare a solution, then adds nitric acid to accurately adjust the pH value of the solution to 1.0; dissolves sodium citrate in ethylene glycol to prepare a solution; mixes the two solutions and uniformly mixes; transfers the mixed solution to a microwave reaction kettle, and under the condition that the temperature is 110-130 DEG C and the microwave power is 300-500 W, radiates and reacts for 20-40 min; cools to room temperature, and the obtained product is washed by centrifugation with ethanol for multiple times, and dried, to obtain black bismuth nanoparticles. The application accurately controls the acidic environment of the precursor solution by nitric acid, and utilizes the synergistic and co-reduction effect of sodium citrate and ethylene glycol to quickly and controllably reduce Bi 3+ to elemental Bi to form nanoparticles. The application has outstanding advantages in efficiency, controllability, environmental protection and cost.

The invention relates to the technical field of carbon dioxide trapping, and provides foam metal loaded bismuth oxide and a preparation method and air trapping application thereof, and the foam metal loaded bismuth oxide is composed of a carrier and an active component; the carrier is foam metal pretreated by hydrochloric acid, a microporous structure is formed on the surface of the pretreated foam metal, the active component is mesoporous nano Bi2O3, and the mesoporous nano Bi2O3 is prepared by dissolving bismuth nitrate pentahydrate with ethylene glycol, dispersing with polyvinylpyrrolidone, mixing with a phosphate buffer solution, and carrying out hydrothermal reaction and calcination. Mesoporous nano Bi2O3 is uniformly loaded on the surface and in micropores of foam metal, and the core is that a composite structure of a foam metal carrier and mesoporous nano Bi2O3 active components is pretreated by hydrochloric acid, so that the problem of high energy consumption caused by the desorption temperature higher than 300 DEG C in the existing DAC technology is solved. The foam metal loaded bismuth oxide can adsorb CO2 at normal temperature and normal pressure, the desorption temperature is only 220 DEG C, the cycle performance is excellent, and the foam metal loaded bismuth oxide can be effectively applied to direct air trapping.

The present application relates to a kind of preparation methods of sulfur vanadium co-doped bismuth tungstate visible light catalyst, the catalyst is assisted by urea hydrothermal method, with sodium tungstate, bismuth nitrate, thiourea, citric acid, ammonium metavanadate, urea as raw material, configuration certain concentration of thiourea and citric acid aqueous solution as sulfur source;Configuration certain concentration of ammonium metavanadate aqueous solution as vanadium source.Sulfur source and vanadium source are mixed after drop by drop to be added to bismuth nitrate solution, after stirring, transfer to hydrothermal kettle, the hydrothermal kettle is placed in blast oven and hydrothermal treatment cooling, centrifugal separation product, washing and drying obtain sulfur vanadium co-doped BWO visible light catalyst.The method is obtained by one-step hydrothermal treatment flower cluster of bismuth tungstate nanosheet composition, simple process, low equipment requirement, the composite photocatalyst prepared has stronger response under visible light condition, has higher application value in pollution control, environmental protection, new energy preparation and other fields.

The invention discloses a fibroin nanofiber-bismuth nanoparticle composite membrane and a preparation method thereof. The composite membrane is formed by compounding bismuth nanoparticles and fibroin nanofibers; the preparation method comprises the following steps: dispersing fibroin nanofibers in deionized water, heating and stirring until the fibroin nanofibers are dissolved, then adding bismuth nitrate powder, continuously stirring uniformly, and then adding a reducing agent for treatment until no bubble overflows, so that bismuth elementary substances grow on the fibroin nanofibers to obtain a bismuth-based fibroin nanofiber solution; and drying the bismuth-based fibroin nanofiber solution to obtain the bismuth-based fibroin nanofiber composite membrane. The obtained membrane product has excellent hydrophilicity, biodegradability, anti-inflammatory performance and antibacterial performance, is wide in application, can simulate an extracellular matrix structure, is used as an infectious skin wound dressing, can be combined with ion slow release / photo-thermal / photodynamic therapy to promote wound repair, and is safe and effective.

The invention belongs to the field of magnesium ion battery positive electrode materials, and particularly relates to a preparation method of a magnesium ion battery positive electrode material BixVS4 composite material, which comprises the following steps: dissolving an organic reducing agent in N-methyl pyrrolidone, and stirring at room temperature; adding ammonium metavanadate, and stirring at 50-100 DEG C; adding thioacetamide, and continuously stirring; adding hydrochloric acid and stirring until the color of the solution becomes dark green; and adding bismuth nitrate pentahydrate, stirring, carrying out a hydrothermal reaction in a reaction kettle, cooling to room temperature, centrifuging, washing with deionized water and absolute ethyl alcohol for several times, and drying to obtain the BixVS4 composite material. The method has the advantages that VS4 is subjected to cation modification, high conductivity is provided by introduction of metal ions, and charge transfer is accelerated. Bi enters a VS4 crystal lattice, local charge rearrangement is caused, Van der Waals force between VS4 layers is weakened, rapid embedding and de-embedding of Mg < 2 + > are facilitated, and more active sites for embedding of Mg < 2 + > are provided.

This proposal discloses an additive and method for producing ultra-thin electrolytic copper foil with high tensile strength and high elongation. The additive comprises an inorganic nitrate and an organic compound; the inorganic nitrate is one or a combination of ammonium nitrate, copper nitrate, and bismuth nitrate; and the organic compound is a crown ether, a cyclic alcohol, and glycolic acid. By adding the inorganic nitrate / organic compound additive, the present invention produces ultra-thin electrolytic copper foil with a thickness of 6 μm or less, achieving a tensile strength exceeding 500 MPa and an elongation exceeding 5%.

This invention relates to a method for in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste. The technical solution is as follows: vanadium-containing solid waste is ground into powder, and the resulting vanadium-containing solid waste powder is mixed with vanadium pentoxide powder. The resulting vanadium-containing geopolymer precursor is mixed with an alkaline activator and stirred evenly to obtain a vanadium-containing geopolymer slurry. The vanadium-containing geopolymer slurry is placed in a mold, cured, demolded, cured a second time, and crushed to obtain a crushed vanadium-containing geopolymer. The crushed vanadium-containing geopolymer is mixed with deionized water to obtain a vanadium-containing geopolymer aqueous solution. Bismuth nitrate solution is added to the vanadium-containing geopolymer aqueous solution, mixed evenly, and the pH value is adjusted. A hydrothermal reaction is then carried out. Solid-liquid separation, washing, and drying are performed to obtain the visible light photocatalytic geopolymer. This invention can efficiently utilize low-vanadium content and completely eliminate vanadium. The in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste not only effectively decomposes organic pollutants under visible light conditions but also effectively fixes vanadium in the vanadium-containing solid waste.

The invention belongs to the technical field of electrochemical sensing, and discloses a preparation method and application of BiOCl and a bismuth membrane electrode. The preparation method of BiOCl comprises the following steps: heating and dissolving bismuth nitrate into concentrated nitric acid, then adding bismuth trioxide into the solution, then adding concentrated hydrochloric acid, fully stirring, standing and cooling to room temperature to obtain a solution A; preparing a 15-25 wt% sodium hydroxide solution as a solution B; the preparation method comprises the following steps: adding water into a reaction container, heating to 65-85 DEG C, then adding concentrated hydrochloric acid, then adding a non-sulfur non-phosphorus surfactant while stirring, stirring until the solution is clear, simultaneously dropwise adding the solution A and the solution B into the reaction container, reacting for 15-15.5 hours, then dropwise adding the solution B again, adjusting the pH value of the solution to 9-11, cooling to room temperature, and drying to obtain the target product BiOCl. The bismuth membrane electrode is obtained by modifying a carbon fiber electrode with BiOCl. The bismuth membrane electrode can be used for detecting one or two of Pb < 2 + > content and Cd < 2 + > content in a water body / blood, and can also be used for integrating a portable heavy metal detection device.

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.